The overpass on the Shklo – Kota road rebuilding project
Students Name: Patrylo Serhiy Mykolaiovych
Qualification Level: magister
Speciality: Bridges and Transport Tunnels
Institute: Institute of Civil Engineering and Building Systems
Mode of Study: part
Academic Year: 2023-2024 н.р.
Language of Defence: ukrainian
Abstract: Object of research: The year of construction of the overpass is 1978. The overpass is located on a straight section of the road and at an angle close to the straight, in run 1 - 2 it crosses a local road that was previously used to transport sulfur ore from the quarry (~1.6 km to the overpass) to the technological complex of the State Enterprise " Novoyavorivsk State Mining and Chemical Enterprise "Sirka" (~0.6 km to the overpass), Longitudinal profile of the road section of the overpass is single-slope with a slope from support Op-0 to support Op-3. The maximum longitudinal slope of the road section of the overpass is 28 ‰, minimum - 1 ‰. The cross profile of the roadway is twoslope with slopes to the edges of the roadway. The maximum cross slope of the roadway part of the overpass is 28 ‰, the minimum is 7 ‰. The span structure of the overpass is made according to the standard design of the 3.503-121 series. Overpass dimensions: Г11.31 + 2 ? 1.5 m. The roadway and sidewalks are covered with asphalt concrete. the main beams are prestressed reinforced concrete I-beams, made according to the standard design of the 3.503-12 series, united in the transverse direction along the upper shelves of the beams with the help of monolithic reinforced concrete seams with a width of 0.92 ... 0.97 m. Coastal and intermediate supports of the overpass - reinforced concrete singlerow risers. The subject of the study: the operational state of the overpass is defined as state 5 - inoperable, therefore the project provides for the implementation of a complex of construction works to improve the operational state of the overpass and approaches. The purpose of the study: The project envisages bringing the geometric characteristics of the overpass to the requirements of current regulatory documents. According to Clause 8.3 of DBN V.2.3-22:2009, the project envisages the restoration of the design load capacity of the overpass, namely the passage of temporary loads H-30 and NK-80 through the overpass. 8 During the execution of construction works on the capital repair of the overpass, it is planned to block the movement of motor vehicles. For the passage of motor vehicles, the project envisages the arrangement of a temporary detour from the existing roads. As a result of the capital repair of the overpass, a reliable transport connection of the population centers of the region and objects of industrial activity among themselves and with the general road network will be ensured, transport and operational indicators will be improved, the cost of transporting goods will be reduced and the time they will be on the road, traffic safety will increase. Research results The overpass overhaul project envisages the replacement of three existing beams of the T-section span structure in span 1-2 with new I-section beams 21 m long. Since the I-section beams have less rigidity than the T-section beams, the step between the beams The I-section was reduced to 1.9m compared to the 2.35m step between the beams of the T-section. This dictated the need to reduce the step to 1.9m between the extreme beams in spans 0-1 and 2-3 and cut concreted ones (during the construction of the overpass) shelves with a width of 0.34 m. Dismantling and re-installation of the outer beams is provided for this. The static scheme of the projected overpass is a three-span split, beam structure, with an estimated span of 20.4 m. On the upper floor, the existing beams of the span structure are combined with a monolithic reinforced concrete slab with a minimum thickness of 0.14 m, and new ones with a minimum thickness of 0.22 m. The reinforced concrete slab of the carriageway is included in joint work with the existing beams of the span structure through anchors, and with new ones through the release of reinforcement from the beams. The project envisages the installation of effective anti-corrosion protection of the beams of the span structure.